Extension module



FIG. 1 is a front perspective view of an extension module in accordance with our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is another front perspective view showing the extension module of FIG. 1 in a position of use assembled with a wireless signal transmission device;

FIG. 10 is a rear perspective view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a left view thereof;

FIG. 14 is a right view thereof;

FIG. 15 is a top view thereof; and,

FIG. 16 is a bottom view thereof.

The additional broken line subject matter showing the wireless signal transmission device in FIGS. 9-16 depict environment only and form no part of the claim, while all other broken lines depict portions of the extension module that form no part of the claimed design. 

CLAIM The ornamental design for an extension module, as shown and described. 